Why is the d3 <div> tooltip showing identical information on mouseover for every element?

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There could be a few reasons for this behavior:

1. The tooltip code is not properly referencing the data for each element, so it is showing the same information for all elements.
2. The data for each element is actually identical, so it is being correctly represented by the tooltip.
3. There is a bug in the tooltip code that is causing it to display the same information for all elements.

To fix the issue, it would be necessary to examine the code and data being used to generate the tooltips, identify any errors or bugs, and make any necessary corrections.